fix: support JWT exp offset as a config parameter and add instead of subtract

[sdewitt-newrelic]

Adds

• Expose the expiration offset used when calculating the exp value of the JSON Claims Set for the JWT as a configuration parameter

Fixes

• When setting the exp value of the JSON Claims Set for the JWT, add to current time instead of subtract

[kanwaljit-mq]

Issue still there. Not sure how to reopen the bug. so leaving a comment File "/nr-code/app/src/newrelic_logging/api.py", line 81, in aut henticate self.authenticator.authenticate(session) File "/nr-code/app/src/newrelic_logging/auth.py", line 199, in a uthenticate self.authenticate_with_jwt(session) File "/nr-code/app/src/newrelic_logging/auth.py", line 109, in a uthenticate_with_jwt exp = int(( AttributeError: 'tuple' object has no attribute 'timestamp'

No tupple exists yet we are trying to access it.